Where does erythema appear after a tick bite? - briefly
The rash typically appears as a red, expanding circular lesion at the tick‑attachment site, most often on the arm or leg. It may enlarge into a target‑like pattern called «erythema migrans».
Where does erythema appear after a tick bite? - in detail
Erythema that develops after a tick attachment typically manifests at the site of the bite. The lesion appears as a circular or oval area of redness, often expanding outward from the point of attachment. Characteristic features include:
- Central clearing that creates a target‑like appearance, known as a “bull’s‑eye” rash.
- Diameter ranging from a few millimetres to several centimetres; expansion may occur over several days.
- Uniform coloration without vesicles or pustules in the early stage.
In some cases, additional erythematous lesions may arise at distant body sites. These secondary rashes are usually linked to systemic dissemination of the pathogen and present as:
- Multiple small, flat macules or papules.
- Lesions on the trunk, extremities, or face.
- Occasionally, larger plaques resembling the primary lesion.
The timing of rash appearance varies. The primary lesion often emerges within 3–30 days after the bite, most commonly between 7 and 14 days. Secondary lesions, when present, tend to follow the primary rash by several days to weeks.
Recognition of the typical location and morphology of the erythema is essential for prompt diagnosis and treatment of tick‑borne infections.